Radiator cap



Jan. 27, J PUNKE 1,789,986

I RADIATOR CAP Filed July 25, 1927 awoento'o Join r/T Fara A e Patented Jan. 27, 1931 UNITED STATES PVATENTOFFIZ'CE JOHN J. PUNKE, or DETROIT, MIOHiGAN, AssIeI On Toner? MOTOR CAR CORPORA- TION, F DETROIT, MICHIGAN, A CORPORATION OF VIRGINIA RADIATOR CA]? Application. filed; July 25, 1927.

This invention relates to radiator caps and more particularly to a unique and novel structure and arrangement of parts tendlng to sImplify, render more efiicient and improve generally devices of this character.

The invention has as one of its primary objects to provide a radiator cap of a relative flat type and to construct this cap with an extended central hub portion adapted to ex- 1;) tend below the surface of the radiator cap boss on the radiator shell. vVith this construction it is proposed to interiorly thread the central hub portion of the cap for engagement with exteriorly arranged threads on the filler neck and to provide a space between the filler neck and the adjacent portion of the shell so that when the closure cap is in place the hub extends into the said space and below the upper surface of the boss formed on the radiator shell. As a consequence of such a construction any water which leaks past the gasket carried by the cap and through the threads will be delivered inside the radiae tor shell and prevented from leaking on the exterior of the shell as is customary with many types of radiator constructions now generally in use.

The several objects, advantages and novel details of construction of this invention will so be made more apparent as this description proceeds especially when considered in connection with the accompanying drawings, wherein:

The figure fragmentarily illustrates a P radiator in elevation with the cap and certain parts of the associated. structure in vertica section. Referring now particularly to the drawing wherein like reference characters indicate like parts, it will be noted that there is fragmentarily illustrated a radiator 10 including a shell 11 provided with a radiator cap boss 12. The reference character 13'in dicates the filler neck and 14 the closure cap therefor. The filler neck is exteriorly Serial No. 208,363.

threaded. as at 15 for engagement by interiorly arranged threads 16 formed on an 2 extended centrally arranged hub portion 17 of the closure cap 14. By arranging the hub portion 17 centrally of the cap there is provided a radially extending flange portion 18 which in the embodiment of the invention herein illustrated is of suliicient width to substantially overlie the boss 12 formed on the radiator shell. The reference character 19 indicates a gasket and20 a spring anranged between the gasket and the inner surface of the cap 14. I

The radiator shell is cut away to provide a recess orv space 21 which surroundsthe filler neck and when the cap 14 is screwed intoplace the central hub portion 17 thereof extends into this recess or space 21 and thus is located below the top or upper surface 22 of the shell boss 12.

With this construction a relatively flat type design of cap may be obtained and with the hub 17 extending below the upper surface of the radiator shell any water which leaks past the gasket and downwardly through the interengaging threads of the neck and cap will be delivered inside the shell. Thus it is possible to prevent leakage from the radiator to the exterior of the shell and to thus overcome a notable objection found in heretofore known constructions.

While an embodiment of theinvention has been illustrated and described herein somewhat in detail it will be readily apparent to those skilled in this art that many changes may be made in the specific construction and arrangement of parts herein illustrated without departing from the spirit and scope of this invention and to this end reservation is made to make such changes as may come within the purview of the accompanying claim.

What I claim as my invention is:

In a. radiator, a shell provided with an upwardly extending apertured boss, an exteriorly threaded filler neck extending through said boss andspac-ed from the side Walls thereof, a closure member provided With an extended centrally arranged hub portion interiorly threaded for engagement with the filler neck and adapted to extend into the space between the latter and side Walls of the boss to a point substantially below the top surface of the boss, and an annular laterally extending flange upon said cap adapted to overhang said boss to conceal the aperture therein.

In testimony whereof I aflix my signature.

JOHN J. PUNKE. 

